کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1517097 | 1511602 | 2008 | 6 صفحه PDF | دانلود رایگان |
The Li+- and Na+-doped hexacelsians (HC) synthesized from Ba-LTA synthetic zeolite as precursors were used for preparation of monoclinic celsians (MC). The doped pure MC and mixture HC/MC species were obtained by thermally induced polymorphous transformation at 1200 °C. Synthesized-doped MC have been characterized by X-ray powder diffraction and spectroscopic (infrared, Raman and 29Si magic angle spinning nuclear magnetic resonance) methods. The obtained results suggest that in all investigated samples Na+ or Li+ dopants were incorporated in MC crystal structures during thermal transformation of a zeolite. It has been shown that HC→MC transformation depends on molar fractions of alkali cations. These findings combined with used temperature/time conditions could help in optimization of MC synthesis route.
Journal: Journal of Physics and Chemistry of Solids - Volume 69, Issue 11, November 2008, Pages 2827–2832